package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BacsContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "LoginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher matcher = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1.获取本次请求的url
        String requestURI = request.getRequestURI();
        log.info("requestURI: " + requestURI);
        //定义不需要处理的请求路径
        String[] urls=new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources/**",
                "/v2/api-docs"
        };
        //2.判断本次请求是否要处理
        boolean check=check(urls,requestURI);
        //3.如果不需要处理，直接放行
        if(check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request, response);
            return;
        }
        //4.1。判断登陆状态，如果已登陆，直接放行
        if(request.getSession().getAttribute("employee") != null){
            log.info("用户已登录，id为：{}",request.getSession().getAttribute("employee"));
            //创建线程变量储存
            Long empId =(Long) request.getSession().getAttribute("employee");
            BacsContext.setBacsContext(empId);

            filterChain.doFilter(request, response);
            return;
        }
        //4.2。判断登陆状态，如果已登陆，直接放行   移动端
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录，id为：{}",request.getSession().getAttribute("user"));
            //创建线程变量储存
            Long usrId =(Long) request.getSession().getAttribute("user");
            BacsContext.setBacsContext(usrId);

            filterChain.doFilter(request, response);
            return;
        }
        //5.如果未登录则返回登陆结果，通过输出流方式向客户端页面响应数据
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    public boolean check(String[] urls,String requestURI){
        for(String url:urls){
            boolean match = matcher.match(url, requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }
}
